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Journal Articles Journal of Geophysical Research. Oceans Year : 2017

Thin ice and storms: Sea ice deformation from buoy arrays deployed during N-ICE2015

Polona Itkin
Gunnar Spreen
Bin Cheng
Martin Doble
  • Function : Author
Jari Haapala
Nick Hughes
  • Function : Author
Lars Kaleschke
Marcel Nicolaus
Jeremy Wilkinson
  • Function : Author

Abstract

Arctic sea ice has displayed significant thinning as well as an increase in drift speed in recent years. Taken together this suggests an associated rise in sea ice deformation rate. A winter and spring expedition to the sea ice covered region north of Svalbard-the Norwegian young sea ICE2015 expedition (N-ICE2015)—gave an opportunity to deploy extensive buoy arrays and to monitor the deformation of the first-year and second-year ice now common in the majority of the Arctic Basin. During the 5 month long expedition, the ice cover underwent several strong deformation events, including a powerful storm in early February that damaged the ice cover irreversibly. The values of total deformation measured during N-ICE2015 exceed previously measured values in the Arctic Basin at similar scales: At 100 km scale, N-ICE2015 values averaged above 0.1 d-1, compared to rates of 0.08 d-1 or less for previous buoy arrays. The exponent of the power law between the deformation length scale and total deformation developed over the season from 0.37 to 0.54 with an abrupt increase immediately after the early February storm, indicating a weakened ice cover with more free drift of the sea ice floes. Our results point to a general increase in deformation associated with the younger and thinner Arctic sea ice and to a potentially destructive role of winter storms.

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insu-03682746 , version 1 (01-06-2022)

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Polona Itkin, Gunnar Spreen, Bin Cheng, Martin Doble, Fanny Girard-Ardhuin, et al.. Thin ice and storms: Sea ice deformation from buoy arrays deployed during N-ICE2015. Journal of Geophysical Research. Oceans, 2017, 122, pp.4661-4674. ⟨10.1002/2016JC012403⟩. ⟨insu-03682746⟩
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